PP Random Copolymer, PP-RC, is the only semi-crystalline exception among the amorphous alternatives. It is always at least slightly milky but has many advantages (chemical resistance, ductility, use of integral hinge) most of the amorphous materials do not offer. Some PA6 grades are also translucent, but can not really be described as transparent.
The commonly used transparent engineering plastics include PC, PC-HT, PMMA, MABS, Copolyester and amorphous PA12. You may find some more in the drop-down boxes below.
Transparent commodity plastics, such as PS, SBC, SAN, and A-PET are presented under the commodity path.